A self-lubricating forming inner core device suitable for hydrogen energy stainless steel pipe cold rolling processing

Abstract

The application discloses a self-lubricating forming inner core device suitable for hydrogen energy stainless steel pipe cold rolling processing, which comprises an inner mold core and a self-lubricating assembly fixed to one end of the inner mold core, the inner side of the inner mold core is provided with a flow channel, and a plurality of lubricating liquid holes are formed in the surface of the inner mold core, and the inner diameters of the plurality of lubricating liquid holes gradually increase away from the one end of the self-lubricating assembly; the self-lubricating assembly comprises a pump box, a liquid storage tank, a flow guide valve group, a moving shaft group and a plurality of moving partition plates located on the inner side of the pump box, and the pump box is fixedly connected with a guide sealing cover on one side. In the application, through the design of the self-lubricating forming inner core device, it is ensured that the lubricating liquid can be uniformly and continuously distributed on the surface of the inner mold core, especially at the end far away from the lubricating source. Through the optimization of the distribution and size of the lubricating liquid holes, the lubricating effect between the inner mold core and the inner wall of the stainless steel pipe is significantly improved, the friction and wear in the processing process are reduced, and thus the precision and surface quality of the stainless steel pipe cold rolling processing are improved.

Description

Technical Field

[0001] This invention relates to the field of stainless steel tube cold rolling die core technology, specifically a self-lubricating forming inner core device suitable for cold rolling of hydrogen-powered stainless steel tubes. Background Technology

[0002] Seamless stainless steel pipes, as important industrial materials, are widely used in petroleum, chemical, energy, and aerospace industries. To meet the stringent requirements of these high-end applications, the manufacturing process of seamless stainless steel pipes is gradually developing towards higher precision and quality. Cold rolling technology, especially multi-stage cold rolling, has become a key link in the production of seamless stainless steel pipes because it can significantly improve the dimensional accuracy and surface finish of stainless steel pipes. When seamless stainless steel pipes are used to transport hydrogen, the heat of combustion of hydrogen is only 1 / 3 that of natural gas; under the same pressure difference at both ends of the pipeline, the flow rate of hydrogen is three times that of natural gas; therefore, under the same pressure drop, the energy transported using the same pipeline for hydrogen and natural gas is the same, but the volume of hydrogen transported is three times that of natural gas.

[0003] In the cold rolling process of stainless steel tubes, to ensure processing accuracy and finished product quality, a forming core is usually installed inside the stainless steel tube to assist in the shaping and forming process. Traditional forming cores typically employ a pumping structure connected to one end, using a pumping system to deliver lubricant to the core surface to reduce friction between the forming core and the inner wall of the stainless steel tube. However, this traditional structure has significant drawbacks in practical applications.

[0004] First, due to the length of the molded core, the lubricant flow rate decreases as it is delivered from the pumping end to the distal end, resulting in insufficient lubricant supply to the core surface furthest from the pumping end. This uneven lubrication directly increases the coefficient of friction between the distal molded core and the inner wall of the stainless steel tube, significantly increasing wear in this area. The high friction and wear in this region greatly shortens the lifespan of the molded core, and frequent maintenance and replacement increase production costs. Second, the uneven lubricant supply not only affects the lifespan of the molded core but can also lead to processing defects on the inner wall of the stainless steel tube, affecting the final product quality. This problem is particularly pronounced in the processing of long stainless steel tubes, where traditional pumping structures struggle to meet the lubrication requirements for long distances and high precision, failing to effectively improve processing stability and reliability. Therefore, an improved lubrication system is urgently needed that can evenly distribute lubricant across the entire surface of the molded core, reducing wear and extending equipment lifespan.

[0005] In view of this, this paper studies and improves upon existing problems, and provides a self-lubricating forming inner core device suitable for cold rolling of hydrogen-powered stainless steel tubes to solve the current problems. The aim of this technology is to solve the problems and improve its practical value. Summary of the Invention

[0006] The present invention aims to solve one of the technical problems existing in the prior art or related technologies, and provides a self-lubricating forming inner core device suitable for cold rolling of hydrogen energy stainless steel tubes.

[0007] Therefore, the technical solution adopted by the present invention is as follows: a self-lubricating forming inner core device suitable for cold rolling of hydrogen-powered stainless steel pipes, comprising: an inner mold core and a self-lubricating assembly fixed to one end of the inner mold core; the inner mold core has a flow channel on its inner side and a plurality of lubricating fluid holes on its surface, and the inner diameter of the plurality of lubricating fluid holes gradually increases along the end away from the self-lubricating assembly; the self-lubricating assembly includes a pump box, a storage tank, a flow guide valve group, a moving shaft group, and a plurality of moving partitions located inside the pump box; a guide seal cover is fixedly connected to one side of the pump box; the moving shaft group is rotatably mounted inside the pump box and a rotating shaft valve is fixedly connected to one end of the pump box and rotatably mounted inside the flow guide valve group; the surface of the flow guide valve group has a plurality of guide holes that penetrate the guide seal cover and are evenly distributed in a circumferential direction; the moving partitions are evenly distributed in a circumferential direction. The pump box has an inner side where one end of the guide hole corresponds to and communicates with the gap between adjacent moving partitions. A liquid storage tank is fixedly installed on one side of the pump box, and a drive motor for driving the rotating shaft assembly is fixedly installed on the other side of the liquid storage tank. The pump box has a liquid guiding cavity on its inner side, and one end of the liquid guiding cavity is connected to the inner cavity of the liquid storage tank. A one-way valve body is provided on one side of the liquid guiding cavity, corresponding to and communicating with the gap between adjacent moving partitions. The pump box has a return groove on its inner side for guiding the movement of the moving partitions. A pivot pin is rotatably installed on one side of the moving partition on the inner side of the pump box, and a spring is provided at one end of the pivot pin. The spring is used to maintain the elastic contact between the moving partition and the surface of the moving shaft assembly. The moving shaft assembly is used to eccentrically rotate and push the moving partition to move inward toward the return groove. The surface of the pivot valve has a valve groove.

[0008] In a preferred embodiment, the present invention can be further configured as follows: the moving shaft assembly includes a main shaft, an eccentric wheel, and a stop wheel. The eccentric wheel is fixed to the surface of the main shaft and sleeved on the inner side of the stop wheel. The upper and lower sides of the stop wheel and the upper and lower sides of the moving partition slide against and seal one side of the pump box cavity and the guide seal cover. The stop wheel has a circular ring structure, and the center of the stop wheel is offset from the axis of the main shaft. Under the drive of the drive motor, the rotation of the main shaft causes the stop wheel to make eccentric movement to push the moving partition back into the return groove. Under the action, the moving partition can be re-exported to realize the reciprocating movement of the moving partition.

[0009] In a preferred embodiment, the present invention can be further configured as follows: the movable partition and the return groove are both arc-shaped and their centers are arranged coaxially with the pivot pin; the spring is fixed to the inner side of the reservoir to drive the spring and the movable partition to rotate so that one side of the movable partition is always in sliding contact with the surface of the abutment wheel; under the effect of the sliding contact between the adjacent movable partitions and the surface of the abutment wheel, independent cavities are formed between the adjacent movable partitions; the lubricating solution inside the reservoir is introduced into the cavity through the liquid guiding cavity and the one-way valve body and discharged through the connection with the guide hole; the eccentric rotation of the movable shaft group realizes the change of the cavity between each movable partition, thereby realizing the pressurized injection of oil.

[0010] In a preferred embodiment, the present invention can be further configured such that the liquid guiding chamber and the one-way valve body are used to guide the lubricating oil inside the reservoir into the cavity between each adjacent moving partition.

[0011] In a preferred embodiment, the present invention can be further configured as follows: the rotary valve has a conical structure and its outer periphery slides against the inner side of the guide valve assembly to seal the end of the guide hole as the rotating shaft assembly rotates. The rotary valve surface has a notch for the discharge of oil inside the guide hole. The width of the rotary valve is smaller than the gap width between adjacent guide holes. During the rotation of the rotating shaft assembly, as the cavity between the moving partitions shrinks, the rotary valve seals the guide hole to pressurize the solution inside the cavity. When the valve groove rotates to the guide hole port, the internal pressure is released instantaneously, and this part of the oil is sprayed out and pumped into the lubricating fluid hole.

[0012] In a preferred embodiment, the present invention may be further configured such that: a connecting pipe is provided on one side of the liquid storage tank for introducing lubricating fluid or grease, and the surface of the pump box is provided with a guide hole communicating with the inner side of the abutment wheel.

[0013] In a preferred embodiment, the present invention can be further configured as follows: the inner mold core is a cast iron tube structure, the number of lubricating fluid holes is several and evenly divided into several groups, each group of lubricating fluid holes is evenly distributed in a circumferential direction on the surface of the inner mold core, and the spacing between each group of lubricating fluid holes gradually decreases along the direction away from the self-lubricating component, effectively guiding the lubricating oil to be discharged from the surface of the inner mold core at the end away from the self-lubricating component, and ensuring the uniformity of lubricating fluid distribution on the surface of the inner mold core.

[0014] The beneficial effects achieved by this invention are as follows: 1. In this invention, the design of the self-lubricating forming inner core device ensures that the lubricating fluid is evenly and continuously distributed on the surface of the inner mold core, especially at the end furthest from the lubrication source. By optimizing the distribution and size of the lubricating fluid holes, the lubrication effect between the inner mold core and the inner wall of the stainless steel tube is significantly improved, reducing friction and wear during processing, thereby improving the precision and surface quality of the cold rolling of the stainless steel tube.

[0015] 2. In this invention, the eccentric rotation of the moving shaft assembly driven by the drive motor is used to achieve the change of the cavity between each moving partition plate, thereby realizing the pressurized injection of oil. The lubricating fluid outlet is ensured by the lubricating fluid holes with progressively larger diameters on the surface of the inner mold core, thus avoiding the defect problem of less lubricating fluid outlet from the lubricating fluid holes on the far end of the inner mold core surface and improving the lubrication uniformity of the inner mold core surface.

[0016] 3. In this invention, the eccentric rotation of the drive shaft assembly by a drive motor achieves automatic pressurization and injection of lubricating fluid without additional manual intervention, significantly improving production efficiency. This system can automatically adjust the lubricating fluid supply according to actual processing needs, ensuring continuous and consistent lubrication during processing, thereby meeting the requirements of large-scale cold rolling of stainless steel pipes and improving the automation level and overall efficiency of the production line. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of a self-lubricating component structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the inner mold core according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of a pump box according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of a pump box according to an embodiment of the present invention; Figure 6 This is an exploded view of the moving shaft assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a movable partition structure according to an embodiment of the present invention; Figure 8 This is an exploded view of the flow guide valve assembly according to an embodiment of the present invention.

[0018] Figure label: 100. Inner mold core; 110. Lubricating fluid hole; 200. Self-lubricating assembly; 210. Pump box; 220. Liquid reservoir; 230. Flow guide valve assembly; 240. Moving shaft assembly; 250. Moving partition; 211. Guide seal cover; 212. Liquid guide chamber; 213. One-way valve body; 214. Return groove; 231. Dividing guide hole; 232. Rotary shaft valve; 233. Valve groove; 241. Main shaft; 242. Eccentric wheel; 243. Abutment wheel; 251. Rotating pin; 252. Clockwork spring; 300. Drive motor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0020] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0021] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a self-lubricating forming inner core device suitable for cold rolling of hydrogen-powered stainless steel tubes.

[0022] Combination Figures 1-8 As shown, the present invention provides a self-lubricating forming inner core device suitable for cold rolling of hydrogen-powered stainless steel pipes, comprising: an inner mold core 100 and a self-lubricating assembly 200 fixed to one end of the inner mold core 100. The inner mold core 100 has a flow channel on its inner side and a plurality of lubricating fluid holes 110 are formed on its surface, with the inner diameter of the lubricating fluid holes 110 gradually increasing along the end away from the self-lubricating assembly 200. The self-lubricating assembly 200 includes a pump box 210, a liquid storage tank 220, and a flow guide valve group 230. The pump housing 210 includes a moving shaft assembly 240 and several moving baffles 250 located inside the pump housing 210. A guide seal cover 211 is fixedly connected to one side of the pump housing 210. The moving shaft assembly 240 is rotatably mounted inside the pump housing 210, and one end is fixedly connected to a rotating shaft valve 232 rotatably mounted inside the guide valve assembly 230. The surface of the guide valve assembly 230 is provided with several guide holes 231 that penetrate the guide seal cover 211 and are evenly distributed in a circumferential direction. The moving baffles 250 are evenly distributed in a circumferential direction inside the pump housing 210. One end of the guide hole 231 corresponds to and communicates with the gap between adjacent moving partitions 250; a liquid storage tank 220 is fixedly installed on one side of the pump box 210, and a drive motor 300 for driving the rotating shaft assembly 240 is fixedly installed on the other side of the liquid storage tank 220; a liquid guiding cavity 212 is provided inside the pump box 210, and one end of the liquid guiding cavity 212 is connected to the inner cavity of the liquid storage tank 220; a one-way valve body is provided on one side of the liquid guiding cavity 212, which corresponds to and communicates with the gap between adjacent moving partitions 250. 213. The pump box 210 has a return groove 214 on its inner side for guiding the movement of the movable partition 250. The movable partition 250 has a pivot pin 251 rotatably mounted on one side of the pump box 210. One end of the pivot pin 251 is provided with a spring 252. The spring 252 is used to maintain the elastic contact between the movable partition 250 and the surface of the movable shaft assembly 240. The movable shaft assembly 240 is used to eccentrically rotate and push the movable partition 250 to move inward toward the return groove 214. The surface of the rotating shaft valve 232 is provided with a valve groove 233.

[0023] In this embodiment, the moving shaft assembly 240 includes a main shaft 241, an eccentric wheel 242 and abutment wheel 243. The eccentric wheel 242 is fixed to the surface of the main shaft 241 and sleeved on the inner side of the abutment wheel 243. The upper and lower sides of the abutment wheel 243 and the upper and lower sides of the moving partition 250 slide against and seal the inner cavity of the pump box 210 and one side of the guide seal cover 211.

[0024] In this embodiment, the abutment wheel 243 has a circular structure, and the center of the abutment wheel 243 is offset from the axis of the main shaft 241.

[0025] Specifically, driven by the drive motor 300, the rotation of the main shaft 241 causes the abutment wheel 243 to make eccentric movements to push back the movable partition 250 and retract it into the return groove 214. Under the action of the spring 252, the movable partition 250 can be re-extracted and enter the reciprocating motion of the movable partition 250.

[0026] In this embodiment, both the movable partition 250 and the return groove 214 are arc-shaped and their centers are arranged coaxially with the pivot pin 251. The spring 252 is fixed to the inside of the liquid storage tank 220 to drive the spring 252 and the movable partition 250 to rotate so that one side of the movable partition 250 always slides against the surface of the abutment wheel 243.

[0027] Specifically, under the sliding contact effect between the adjacent movable partition 250 and the surface of the abutment wheel 243, an independent cavity is formed between the adjacent movable partition 250. The lubricating solution inside the reservoir 220 is introduced into the cavity through the liquid guiding cavity 212 and the one-way valve body 213 and discharged through the guide hole 231. The eccentric rotation of the movable shaft assembly 240 realizes the change of the cavity between each movable partition 250, thereby realizing the pressurized injection of oil.

[0028] In this embodiment, the liquid guiding chamber 212 and the one-way valve body 213 are used to guide the lubricating oil inside the liquid storage tank 220 into the cavity between each adjacent moving partition 250 in a one-way direction.

[0029] In this embodiment, the rotary valve 232 has a conical structure and its outer periphery slides against the inner side of the guide valve assembly 230 to seal the end of the guide hole 231 as it rotates with the moving shaft assembly 240. The rotary valve 232 has a notch on its surface for the discharge of oil from the guide hole 231. The width of the rotary valve 232 is smaller than the gap width between adjacent guide holes 231.

[0030] Specifically, as the cavity between the moving partitions 250 decreases during the rotation of the moving shaft assembly 240, the solution inside the cavity is pressurized by the sealing effect of the rotating shaft valve 232 on the guide hole 231. When the valve groove 233 rotates to the port of the guide hole 231, the internal pressure is released instantaneously, and this part of the oil is sprayed out and pumped into the lubricating fluid hole 110.

[0031] In this embodiment, a connecting pipe is provided on one side of the liquid storage tank 220 for introducing lubricating fluid or grease, and a guide hole is provided on the surface of the pump box 210 to communicate with the inner side of the abutment wheel 243.

[0032] Specifically, the lubricating fluid is stored in the liquid storage tank 220, which is connected to the inside of the abutment wheel 243 to lubricate the movement between the eccentric wheel 242 and the abutment wheel 243. The pivot pin 251 and the spring spring 252 are located inside the liquid storage tank 220 and can also be lubricated by the stored lubricating fluid, thereby improving the service life of the equipment.

[0033] In this embodiment, the inner mold core 100 is a cast iron tube structure, and the number of lubricating fluid holes 110 is several and is evenly divided into several groups. Each group of lubricating fluid holes 110 is evenly distributed in the circumferential direction on the surface of the inner mold core 100, and the distance between each group of lubricating fluid holes 110 gradually decreases in the direction away from the self-lubricating component 200.

[0034] Specifically, the lubricating fluid holes 110 on the surface of the inner mold core 100 at the end away from the self-lubricating component 200 are more densely distributed and have a larger inner diameter, which effectively guides the lubricating oil to be discharged from the surface of the inner mold core 100 at the end away from the self-lubricating component 200, ensuring the uniform distribution of lubricating fluid on the surface of the inner mold core 100.

[0035] Working principle and usage process of this invention: The inner mold core 100 is inserted into the stainless steel tube and serves as the forming inner core structure during the cold rolling process of the stainless steel tube. The surface of the inner mold core 100 has a plurality of lubricating fluid holes 110, which gradually increase in diameter along the end away from the self-lubricating component 200 to uniformly distribute the lubricating fluid. The self-lubricating assembly 200 includes a pump housing 210, a liquid storage tank 220, a flow guide valve assembly 230, and a moving shaft assembly 240. After the drive motor 300 is started, the moving shaft assembly 240 begins to rotate. The moving shaft assembly 240 drives the eccentric wheel 242 via the main shaft 241, causing the eccentric wheel 242 to rotate eccentrically around its axis. During the rotation of the eccentric wheel 242, the eccentric wheel 242 pushes the moving partition 250 via the abutment wheel 243, causing the moving partition 250 to reciprocate within the return groove 214 inside the pump housing 210. When the movable partition 250 moves to the inside of the return groove 214, the volume of the cavity increases, forming a negative pressure. The lubricating fluid in the storage tank 220 is drawn into the cavity through the liquid guiding chamber 212 and the one-way valve body 213. When the movable partition 250 moves outward under the elastic action of the spring 252, the volume of the cavity decreases, the lubricating fluid is pressurized, and it is discharged through the guide hole 231 of the guide valve group 230. The rotary valve 232 in the guide valve assembly 230 controls the opening and closing of the guide hole 231. When the rotary valve 232 rotates to the end of the guide hole 231, the lubricating fluid in the guide hole 231 is discharged through the valve groove 233 under pressure. This lubricating fluid is sprayed into the inner mold core 100 and evenly distributed on the surface of the inner mold core 100 through the lubricating fluid holes 110, thus lubricating the inner wall of the stainless steel tube. The distribution of the lubricating fluid holes 110 is designed with a gradually decreasing spacing and a gradually increasing diameter along the end away from the self-lubricating component 200. This design ensures that the lubricating fluid can be discharged more concentratedly in areas far from the lubrication source, ensuring the uniformity of the lubricating fluid on the surface of the inner mold core 100, thereby improving the lubrication effect during the cold rolling process of the stainless steel tube. Throughout the cold rolling process, the inner mold core 100 remains in contact with the inner wall of the stainless steel tube. The lubricating fluid provided by the self-lubricating component 200 reduces friction and wear, improving processing accuracy and product quality.

[0036] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A self-lubricating forming inner core device suitable for cold rolling of hydrogen-powered stainless steel pipes, characterized in that, include: The inner mold core (100) and a self-lubricating assembly (200) fixed to one end of the inner mold core (100) are provided with a flow channel on the inner side of the inner mold core (100) and a plurality of lubricating fluid holes (110) are opened on the surface of the inner mold core (100), and the inner diameter of the plurality of lubricating fluid holes (110) gradually increases along the end away from the self-lubricating assembly (200); the self-lubricating assembly (200) includes a pump box (210), a liquid storage tank (220), a flow guide valve group (230), a moving shaft group (240), and a plurality of moving partitions (250) located inside the pump box (210). A guide seal cover (211) is fixedly connected to one side of the pump box (210). The moving shaft assembly (240) is rotatably mounted inside the pump box (210), and one end is fixedly connected to a rotating shaft valve (232) rotatably mounted inside the flow guide valve assembly (230). The surface of the flow guide valve assembly (230) is provided with several guide holes (231) that penetrate the guide seal cover (211) and are evenly distributed in the circumferential direction. The moving partitions (250) are evenly distributed in the circumferential direction inside the pump box (210), and one end of the guide hole (231) is separated from the adjacent moving partition (250). The gaps are one-to-one and connected; a liquid storage tank (220) is fixedly installed on one side of the pump box (210), and a drive motor (300) for driving the rotating shaft assembly (240) is fixedly installed on the other side of the liquid storage tank (220). A liquid guiding cavity (212) is provided on the inner side of the pump box (210), and one end of the liquid guiding cavity (212) is connected to the inner cavity of the liquid storage tank (220). A one-way valve body (213) is provided on one side of the liquid guiding cavity (212) and is one-to-one and connected to the gap between the adjacent moving partition (250). The inner side of the pump box (210) A return groove (214) is provided for guiding the movement of the movable partition (250). A pivot pin (251) is provided on one side of the movable partition (250) and is rotatably mounted inside the pump box (210). A spring spring (252) is provided at one end of the pivot pin (251). The spring spring (252) is used to maintain the elastic contact between the movable partition (250) and the surface of the movable shaft assembly (240). The movable shaft assembly (240) is used to eccentrically rotate and push the movable partition (250) to move inside the return groove (214). A valve groove (233) is provided on the surface of the rotating shaft valve (232).

2. The self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel pipes according to claim 1, characterized in that, The moving shaft assembly (240) includes a main shaft (241), an eccentric wheel (242), and a stop wheel (243). The eccentric wheel (242) is fixed to the surface of the main shaft (241) and sleeved on the inner side of the stop wheel (243). The upper and lower sides of the stop wheel (243) and the upper and lower sides of the moving partition (250) slide and abut against the inner cavity of the pump box (210) and one side of the guide seal cover (211) and seal.

3. The self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel pipes according to claim 2, characterized in that, The abutment wheel (243) has a circular structure, and the center of the abutment wheel (243) is offset from the axis of the main shaft (241).

4. The self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel pipes according to claim 2, characterized in that, The movable partition (250) and the return groove (214) are both arc-shaped and their centers are arranged coaxially with the pivot pin (251). The spring spring (252) is fixed to the inside of the liquid storage tank (220) to drive the spring spring (252) and the movable partition (250) to rotate so that one side of the movable partition (250) always slides against the surface of the abutment wheel (243).

5. A self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel pipes according to claim 1, characterized in that, The liquid guiding chamber (212) and the one-way valve body (213) are used to guide the lubricating oil inside the liquid storage tank (220) into the cavity between each adjacent moving partition (250) in a one-way direction.

6. A self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel pipes according to claim 1, characterized in that, The rotary valve (232) has a conical structure and slides against the inner side of the guide valve assembly (230) to seal the end of the guide hole (231) as it rotates with the moving shaft assembly (240). The rotary valve (232) has a notch on its surface for the discharge of oil from the guide hole (231). The width of the rotary valve (232) is smaller than the gap width between adjacent guide holes (231).

7. A self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel tubes according to claim 1, characterized in that, The liquid storage tank (220) has a connecting pipe on one side for introducing lubricating fluid or grease, and the surface of the pump box (210) has a guide hole that communicates with the inside of the abutment wheel (243).

8. A self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel tubes according to claim 1, characterized in that, The inner mold core (100) is a cast iron pipe structure.

9. A self-lubricating forming inner core device for cold rolling of hydrogen-powered stainless steel tubes according to claim 1, characterized in that, The number of lubricating fluid holes (110) is several and they are evenly divided into several groups. Each group of lubricating fluid holes (110) is evenly distributed in the circumferential direction on the surface of the inner mold core (100). The distance between each group of lubricating fluid holes (110) gradually decreases in the direction away from the self-lubricating component (200).

Images